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Username Post: 55 chevy firewall        (Topic#363527)
Frankman 
Poster
Posts: 81
Frankman
Reg: 09-25-17
12-05-20 09:25 AM - Post#2809400    

For those of you that have installed ls engines in 55,56,or 57 chevy's is it necessary to do any modifications on the fire wall other than plugging up unneeded holes. I don't think so but just checking, before I get to far and find out that I was wrong. I'm getting the ls engine pretty soon so I want to finish the work on the fire wall.



 


WagonCrazy 
"15th Year" Platinum Supporting Member
Posts: 3257
WagonCrazy
Loc: So Cal
Reg: 06-07-05
12-07-20 06:46 AM - Post#2809522    
    In response to Frankman

On my very modified 57 Nomad, I chose to cut out that rounded firewall and fabricate a new one that looked better with the LS engine. Also made just a bit more room at the back of the engine. But more importantly, you may need to modify the transmission tunnel to get one to fit in there.
Mine has a T56 6 speed, and it's much taller...requiring tunnel sheetmetal modifications.


57 Nomad -LS1 with C4 suspension
59 Apache Fleetside Shortbed BigWindow



Edited by WagonCrazy on 12-07-20 06:47 AM. Reason for edit: No reason given.

 
Frankman 
Poster
Posts: 81
Frankman
Reg: 09-25-17
12-07-20 05:10 PM - Post#2809587    
    In response to WagonCrazy

Thank you for your response.



 
Rick_L 
Member #409
Posts: 27818
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
12-07-20 07:01 PM - Post#2809597    
    In response to Frankman

Note that in the previous replay that he made the firewall mod for appearance. You do not have to do this for the engine to fit in the engine bay and clear the firewall.

On the other hand, some transmissions that are typically used with an LS engine need additional transmission tunnel clearance. This includes 6 speed manual and 6 and 8 speed automatics. 4 speed automatics clear the tunnel.

The other thing that may happen here is that depending on what belt accessory drive, radiator/fan setup, and intake tube arrangement you have, things may get tight at the front of the engine. But with the right combination of parts it will all fit without firewall mods.



 
WagonCrazy 
"15th Year" Platinum Supporting Member
Posts: 3257
WagonCrazy
Loc: So Cal
Reg: 06-07-05
12-09-20 07:58 PM - Post#2809717    
    In response to Frankman



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57 Nomad -LS1 with C4 suspension
59 Apache Fleetside Shortbed BigWindow



 
Frankman 
Poster
Posts: 81
Frankman
Reg: 09-25-17
12-17-20 06:49 PM - Post#2810251    
    In response to Rick_L

mentioned having to use the



 
Frankman 
Poster
Posts: 81
Frankman
Reg: 09-25-17
12-17-20 07:06 PM - Post#2810253    
    In response to Frankman

Ok Rick so I'm thinking a ls3 and 4l60e should work rite. So you mentioned using the rite combination of parts do we know what parts these are.



 


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